What is the most horrible form of execution in history?

This must be in the running of 'execution most horrible':

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On November 14, Friedrich was executed on the wheel at the Severinstor in Cologne . His arms and legs were smashed, then he was braided onto the wheel and put on a stone pillar. He died the following day and was left to feed the birds. In the realm of legend belongs the tradition from the 16th century, his bones were buried in a chapel near Essen-Bredeney.

This was as a result of the murder accredited to Friedrich von Isenberg of Engelbert I. von Berg , the Archbishop of Cologne, on November 7, 1225. Friedrich himself was originally said to have been a clergyman who resigned to join up with the knighthood as the the heir to the then title was believed to be away, missing on a crusade.

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Friedrich von Isenberg , Count of Isenberg, also called Friedrich de Novus Ponte (* before 1193, † November 14, 1226 in Cologne ), was the son of Arnold von Altena , the count of Altena († after 1205) and Mechthild of Holland (others Sources also mention Mathilde of Holland or Mathilde of Cleve as wife [1] ). Its headquarters was the castle Isenberg near Hattingen . He left his uncle 2nd degree Engelbert I. von Berg , the Archbishop of Cologne, on November 7, 1225 in a ravine in today's Gevelsberg invaded by followers. Because of his death, he was arrested and executed.

The murdered archbishop was a popular figure and his death caused an uprising.

The back story is:

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Friedrich traveled to Rome in 1226 with his brothers Dietrich ( bishop in Münster ) and Engelbert ( bishop's choice in Osnabrück ), as well as the Isenberg "Notarius" to Rome to the Curia . Dietrich and Engelbert wanted to undo their suspension and be put back in their offices, but this did not happen. However, Frederick could evidently persuade the pope of his immediate innocence of the crime, since the church spell imposed by Konrad was abolished in Rome. [20] However , this did not change anything about Friedrich's freedom from the birds and persecution in the Reich. On the way back he moved to Liège lodging. There he was recognized by a noble named Balduin of Gennep. He invited Friedrich to a meal and took him prisoner. He sold it to the Count von Geldern for 2,100 marks of silver. Friederich was brought to Cologne. The archbishop had received a reward for the capture.

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